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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic:
Net income	$ 8,186	$ 7,610	$ 24,033	$ 23,211
Weighted-average common shares outstanding	14,417,725	14,695,170	14,435,670	14,687,614
Basic earnings per share	$ 57	$ 52	$ 1.66	$ 1.58
Diluted:
Net Income	$ 8,186	$ 7,610	$ 24,033	$ 23,211
Weighted-average common shares outstanding	14,417,725	14,695,170	14,435,670	14,687,614
Effect of dilutive restricted stock and stock appreciation rights	262,917	248,010	258,123	240,489
Weighted-average common shares outstanding assuming dilution	14,680,642	14,943,180	14,693,793	14,928,103
Diluted earnings per share	$ 56	$ 51	$ 1.64	$ 1.55

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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